91. In solid state electronics, the materials of principal concern are :
(a) Germanium and cadmium
(b) Germanium and silicon
(c) Silicon and cadmium
(d) Silicon and gallium
92. Ge and Si used extensively in electronic industry belong to which group of periodic table :
(a) III A
(b) V B
(c) IV A
(d) IV B
93. At absolute zero temperature a crystal of germanium behaves as :
(a) Good conductor
(b) Semiconductor
(c) Insulator
(d) Superconductor
94. Atomic weight of an atom is :
(a) sum of the number of protons and neutrons
(b) sum of the number of protons and electrons
(c) sum of the number of electrons and neutrons
(d) sum of the number of electrons, protons and neutrons
95. Tick off the material, which is different from the group :
(a) Constantan
(b) Manganin
(c) Nichrome
(d) Brass
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